240406509 has 16 divisors (see below), whose sum is σ = 368456832. Its totient is φ = 136579008.

The previous prime is 240406499. The next prime is 240406513. The reversal of 240406509 is 905604042.

It is not a de Polignac number, because 240406509 - 2⁷ = 240406381 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (240406589) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29454 + ... + 36719.

It is an arithmetic number, because the mean of its divisors is an integer number (23028552).

Almost surely, 2^240406509 is an apocalyptic number.

It is an amenable number.

240406509 is a deficient number, since it is larger than the sum of its proper divisors (128050323).

240406509 is a wasteful number, since it uses less digits than its factorization.

240406509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66356.

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 240406509 is about 15505.0478554566. The cubic root of 240406509 is about 621.7971693846.

The spelling of 240406509 in words is "two hundred forty million, four hundred six thousand, five hundred nine".